Constantine II AE follis, 337-348 AD. 

Obv: CONSTANTINVS IVN NOB C, laureate & cuirassed bust right 
Rev: GLOR-IA EXERC-ITVS, two soldiers holding spears and shields with one 
 standard between them; o on banner
Mintmark: star P(LG) (this is the only one of this type which begins with star P..). 

RIC VII Lyons 281, rated R3.

Contributed by Dane for Antonio Hinojosa, Spain (lucernae), August, 2008.